T&R Test Equipment DMO200 Digital Micro-Ohmmeter
The T&R Test Equipment DMO200 is a rugged, high-current micro-ohmmeter designed for engineers who need fast, accurate, and repeatable low-resistance measurements. With a wide 1–200 A output current range and exceptional 0.1 μΩ resolution, the T&R Test Equipment DMO200 is the ideal instrument for commissioning, maintenance testing, and production-line diagnostics across power networks and industrial environments. Combining portability, precision, and intuitive operation, the T&R DMO200 sets a new standard for field-ready micro-ohmmeters.
High-Performance Low-Resistance Measurement
Built for demanding applications, the DMO200 digital micro ohmmeter uses a four-wire Kelvin measurement system to eliminate lead resistance errors. This ensures true, accurate readings even when testing very low values such as breaker contacts, busbar joints, grounding links, or metallic bonding.
Electrical Performance Highlights
- 1–200 A DC output with <2.5% ripple
- Ultra-fine 0.1 μΩ resolution
- Automatic selection of current, voltage, and resistance ranges
- True RMS measurement for enhanced accuracy
- Stable output ideal for inductive and resistive loads
Intuitive Operation for Fast Field Use
The T&R DMO200 is designed for simplicity without compromising capability. The bright, back-lit LCD displays test current, sense voltage, and resistance simultaneously, while readings are held automatically when the output is switched off. This makes it easy to review results before storing or documenting them.
User-Friendly Operation Features
- Simple output on/off control
- Three programmable preset test currents
- Manual current adjustment via precision control knob
- Clear “output on” and “do not disconnect” indicators
- Automatic protection against high resistance, reversed polarity, and overcurrent
- Temperature monitoring with integrated thermal trip
Advanced Data Management
Efficient documentation is built into the DMO200 digital micro ohmmeter. The instrument stores every test automatically to a USB memory key, ensuring reliable traceability for QA, compliance checks, or asset management.
Data Handling Capabilities
- USB data export for seamless reporting
- Keyboard for adding on-site comments
- Time and date stamping for every reading
- CSV format compatible with Excel and asset systems
- On-screen display of all key parameters
Built for Tough Environments
Lightweight yet durable, the T&R DMO200 is engineered for on-site conditions. Its compact design and universal supply voltage make it suitable for substations, workshops, and industrial plants.
Field-Ready Design
- Only 6.9 kg for easy transport
- Rugged ABS case with protective lid
- Operating range from 0°C to 45°C
- Universal 90–264 V AC supply
- Supplied with high-quality 3 m output lead set
- Optional Kelvin clamps, extension leads, and current clamp
Typical Applications:
The T&R Test Equipment DMO200 excels in a wide range of electrical resistance testing tasks:
- Circuit breaker contact resistance
- Busbar joint integrity checks
- Switchgear and isolator resistance tests
- Grounding and bonding system verification
- Cable joint and conductor resistance
- Production testing of high-current components
The various models of the DMO200:
- (DMO200) 200A DC Digital Micro-Ohmmeter c/w standard 3m output lead set.
- (DMO200 L10) 200A DC Digital Micro-Ohmmeter c/w standard 10m output lead set (No 3m leads)
- (DMO200 224N) 200A DC Digital Micro-Ohmmeter c/w Nevada croc clip 3m output lead set
- (DMO200 224K) 200A DC Digital Micro-Ohmmeter c/w Kelvin Clamp 3m output lead set
❓ Frequently Asked Questions (FAQ)
Q1: What is the maximum test current?
A. The T&R DMO200 provides 1–200 A, with 100 A continuous and 200 A for timed operation.
Q2: Can it be used when both sides of the test object are earthed?
A. Yes. With the optional current clamp, the instrument compensates for parallel earth currents.
Q3: How are results stored?
A. The DMO200 digital micro ohmmeter logs every result, including comments, directly to a USB memory key.
Note: Be sure to check the official datasheet before buying, and the user manual before using any test equipment. Need training? Just reach out - we’re happy to help